Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Income (Loss) Attributable to Parent	$ (258,816)	$ 269,326	$ 1,205,189	$ 1,194,143
Foreign currency translation adjustments	(103,332)	(13,556)	(109,888)	(91,128)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	359	105	501	1,281
Net unrealized holding gains (losses) on available-for-sale investments net of tax expense	433	(138)	4,232	(1,989)
Total other comprehensive income (loss) net of tax	(102,540)	(13,589)	(105,155)	(91,836)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (361,356)	$ 255,737	$ 1,100,034	$ 1,102,307